Crows are among the world's most adaptable and intelligent birds. For example, crows are able to recognize individual human faces, solve simple problems and use simple tools. Watch this example[http://www.youtube.com/watch?v=OYZnsO2ZgWo]. They have evolved a varied language, and are capable of mimicking sounds they hear, including other animals. They also learn to associate noises with specific events, especially with food distribution.